SNLS570C August 2017 – January 2023 DS90UB954-Q1
PRODUCTION DATA
The Bidirectional Control Channel (BCC) supports higher frequency operation when attached to the DS90UB935-Q1 or DS90UB953-Q1 and is also backward compatible with the DS90UB933-Q1 or DS90UB913A-Q1 serializers. The Bidirectional Control Channel is compatible with I2C devices, allowing local I2C target access to device registers as well as bidirectional I2C operation across the link to the Serializer and attached devices. I2C access should not be attempted across the link when Rx Port Lock status is Low. In addition to providing BCC operation, the back channel signaling also supports GPIO operations and advertising device capabilities to the attached Serializer device. The default back channel frequency is selected by the strap setting of the MODE pin. Additional speeds are also available, controlled separately for each Rx Port through the BC_FREQ_SELECT register field in the BCC_CONFIG register 0x58. Back channel frequency operates in 50-Mbps and 2.5-Mbps modes to support DS90UB935-Q1, DS90UB953-Q1 and DS90UB933-Q1 or DS90UB913A-Q1 Serializers.